Swagger-core: Bug: Cannot access YAML: java.lang.NoSuchMethodError

[denny99]

I am trying to use swagger-core for my JAX RS API, but when trying to access the openapi.yaml file (In my case http://localhost:8080/api/openapi.yaml) i'm getting the following error:
java.lang.NoSuchMethodError: com.google.common.collect.Sets$SetView.iterator()Lcom/google/common/collect/UnmodifiableIterator;
The API itself is working as expected. Am i missing something or is this a bug?

Technology
JEE 8
Glassfish 5
JAX-RS 2.26
Swagger-jaxrs2 2.0.0-rc4

Stacktrace
stacktrace.txt
POM.xml
pom.txt
web.xml
web.txt

[denny99]

I finally found the solution.
Glassfish has its own Guava Version which is not compatible with Swagger.

To fix it:
Create a glassfish-web.xml
And add <class-loader delegate="false"/>

[peteclark3]

@denny99 add what? Seeing this issue too...

[denny99]

Weird. It seems i've forgot to add the xml code or it got deleted?
The Glassfish xml should contain this option:
<glassfish-web-app> <class-loader delegate="false"/> </glassfish-web-app>

[vikrantk365]

I'm using spring boot with jersey.
I got the same error with the latest version of guava.
I could see that older version was clearly not getting added to the classpath.
So I tried multiple versions of guava. And the version that worked was com.google.guava:guava:24.1-jre ( <= 24.1-jre).